Unable to access company websites internally after adding an alternative UPN suffix to Active Directory

Hello Experts,

As part of the steps to migrate onto Office 365, I added our external domain name as an alternative UPN suffix within Active Directory and after doing so, we are no longer able to access our company websites internally.

I suspect that adding the UPN suffix has created an DNS issue internally and I am unclear how to resolve it, any information would be greatly appreciated.

Below is our network configuration;

Internal Domain
cadcasbs.local

External Domain
cadca.org

External Websites trying to access internally
www.cadca.org
drugfreekids.cadca.org
forum.cadca.org
cadcadnsconfiguration.PNG
Darrell JamesDirector of Information TechnologyAsked:
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Mike ThomasConsultantCommented:
adding the upn should not matter whatsoever.

with the absence of the cadca.org locally in you dns all lookups will user forwarders or root hints to query external dns, what happens when u do an nslookup? does this external resolution take place?
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Darrell JamesDirector of Information TechnologyAuthor Commented:
Thanks for the help, all of a sudden, it started working again, so I think something else was going on.
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